AUGER DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an auger device capable of preventing a following auger device from colliding against a core member of a preceding element and not only reducing vibration and noise but also improving efficiency of excavation and precision of construction. SOLUTION: In this auger device, a continuous circular ring-like auxiliary ring 4 is arranged coaxially with a shaft body 2 provided with an excavation head 3 at a tip of a lower part in a halfway section of the shaft body. The auxiliary ring 4 is fixed on the shaft body 2 by a plurality of oblique members 5 being obliquely and upward inclined toward the shaft body 2 from the auxiliary ring 4 in an upper part of the auxiliary ring 4. COPYRIGHT: (C)2008,JPO&INPIT